Bacterial activity in South Pole snow
Large populations (200 to 5,000 cells ml21 in snowmelt) of bacteria were present in surface snow and firn from the south pole sampled in January 1999 and 2000. DNA isolated from this snow yielded ribosomal DNA sequences similar to those of several psychrophilic bacteria and a bacterium which aligns...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.488.4406 2023-05-15T13:47:15+02:00 Bacterial activity in South Pole snow Edward J. Carpenter Senjie Lin Douglas G. Capone The Pennsylvania State University CiteSeerX Archives 2000 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.4406 http://www.phytoplankton.uconn.edu/publications/20.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.4406 http://www.phytoplankton.uconn.edu/publications/20.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.phytoplankton.uconn.edu/publications/20.pdf text 2000 ftciteseerx 2016-01-08T08:19:34Z Large populations (200 to 5,000 cells ml21 in snowmelt) of bacteria were present in surface snow and firn from the south pole sampled in January 1999 and 2000. DNA isolated from this snow yielded ribosomal DNA sequences similar to those of several psychrophilic bacteria and a bacterium which aligns closely with members of the genus Deinococcus, an ionizing-radiation- and desiccation-resistant genus. We also obtained evidence of low rates of bacterial DNA and protein synthesis which indicates that the organisms were metabolizing at ambient subzero temperatures (212 to 217°C). There are no reports which document active metabolism of bacteria in the surface snow of the interior of the Antarctic continent. At the south pole, temperatures are extreme and austral winter air temperatures reach about 285°C, while in summer it can warm to about 213°C (mean monthly air tem-perature in December is 226°C). Bacteria have previously been cultured from samples taken from Antarctic ice cores (1), and deep cores from the accreted ice above subglacial Lake Vostok revealed a high diversity (24) of species that were reported to be metabolically active when warmed to 3°C (16). We report here bacterial populations and associated metabolic activity in surface (upper 20 cm) snow and firn collected at the south pole in the austral summer. Sampling. Snow samples were collected on 9 and 18 January Text Antarc* Antarctic South pole South pole Unknown Antarctic Austral Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) South Pole The Antarctic |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Large populations (200 to 5,000 cells ml21 in snowmelt) of bacteria were present in surface snow and firn from the south pole sampled in January 1999 and 2000. DNA isolated from this snow yielded ribosomal DNA sequences similar to those of several psychrophilic bacteria and a bacterium which aligns closely with members of the genus Deinococcus, an ionizing-radiation- and desiccation-resistant genus. We also obtained evidence of low rates of bacterial DNA and protein synthesis which indicates that the organisms were metabolizing at ambient subzero temperatures (212 to 217°C). There are no reports which document active metabolism of bacteria in the surface snow of the interior of the Antarctic continent. At the south pole, temperatures are extreme and austral winter air temperatures reach about 285°C, while in summer it can warm to about 213°C (mean monthly air tem-perature in December is 226°C). Bacteria have previously been cultured from samples taken from Antarctic ice cores (1), and deep cores from the accreted ice above subglacial Lake Vostok revealed a high diversity (24) of species that were reported to be metabolically active when warmed to 3°C (16). We report here bacterial populations and associated metabolic activity in surface (upper 20 cm) snow and firn collected at the south pole in the austral summer. Sampling. Snow samples were collected on 9 and 18 January |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Edward J. Carpenter Senjie Lin Douglas G. Capone |
spellingShingle |
Edward J. Carpenter Senjie Lin Douglas G. Capone Bacterial activity in South Pole snow |
author_facet |
Edward J. Carpenter Senjie Lin Douglas G. Capone |
author_sort |
Edward J. Carpenter |
title |
Bacterial activity in South Pole snow |
title_short |
Bacterial activity in South Pole snow |
title_full |
Bacterial activity in South Pole snow |
title_fullStr |
Bacterial activity in South Pole snow |
title_full_unstemmed |
Bacterial activity in South Pole snow |
title_sort |
bacterial activity in south pole snow |
publishDate |
2000 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.4406 http://www.phytoplankton.uconn.edu/publications/20.pdf |
long_lat |
ENVELOPE(106.000,106.000,-77.500,-77.500) |
geographic |
Antarctic Austral Lake Vostok South Pole The Antarctic |
geographic_facet |
Antarctic Austral Lake Vostok South Pole The Antarctic |
genre |
Antarc* Antarctic South pole South pole |
genre_facet |
Antarc* Antarctic South pole South pole |
op_source |
http://www.phytoplankton.uconn.edu/publications/20.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.4406 http://www.phytoplankton.uconn.edu/publications/20.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766246812197322752 |